A large crayfish lurks under a log which is home to several mayfly nymphs and caddisfly larvae.
In this picture: Arthropod Order Decapoda (Crayfish), Insect Order Ephemeroptera (Mayflies), and Insect Order Trichoptera (Caddisflies).
Troutnut.com is a collection of pictures and information about fly fishing. Fly fishermen, fly tiers, and trout enthusiasts of all stripes can learn more about life beneath the surface of trout streams, as well as how to better imitate aquatic insects with artificial flies to catch trout. There are aquatic insect pictures, underwater pictures, landscape pictures, and a comprehensive reference to the common names of trout stream insects.